Solve: - ⁺8 - ⁺5 + ⁻9 - ⁺11.
Solve: - ⁺1 - ⁺0 + ⁻11 + ⁺8.
Solve: ⁻2 + ⁺21 - ⁺15
Solve: + ⁺3 x ⁻11.
Solve: + ⁺3 X - ⁺15.